class ArbiterTester extends AnyFlatSpec with ChiselScalatestTester {
  "arbiter" should "work" in {
    test(new ArbiterSimpleTree(2, UInt(4.W))) { dut =>
      dut.io.in(0).valid.poke(true)
      dut.io.in(0).bits.poke(14.U)
      dut.io.in(1).valid.poke(false)
      dut.io.out.ready.poke(false)
      dut.clock.step()
      dut.io.out.ready.poke(true)
      dut.clock.step()
      dut.io.out.valid.expect(true) 
      dut.io.out.bits.expect(14.U) 
    }
  }
}